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    List of 38 selected sub-basins

Phase III - III Year Start Sub-Basin
Basin
Sl. No
Sub Basin
District
Registered Ayacut (in Ha)
Chennai Region
Chennai
1
Cooum Chennai /Tiruvallur,
Kanchipuram
13475.23
 
2
Adyar Chennai
18452.89
 
3
Araniyar Chennai
27328.56
 
4
Kosasthalaiyar Tiruvallur
38853.41
Varahanadhi
5
Nallavur Villupuram
8940.35
 
6
Ongur Kanchipuram
7400.05
Ponnaiyar
7
Markandanadhi Dharmapuri
1762.81
 
8
Kambainallur Dharmapuri
4027.26
 
9
Kovilar (Kottapattikallar) Dharmapuri
209.13
 
10
Mottur Tiruvannamalai
0.00
 
11
Valayar Tiruvannamalai
0.00
 
12
Ramakkal Tiruvannamalai
0.00
 
13
Pambanar Verattar Tiruvannamalai
1335.34
 
14
Gadilam Villupuram / Cuddalore
12341.38
 
15
Pambar to Tirukoilur Tiruvannamalai
1709.23
 
16
Thurinjalar Tiruvannamalai
3478.56
Paravanar
17
Paravanar Cuddalore
6704.31
 
18
Uppanar Cuddalore
2631.62
Vellar
19
Gomukinadhi Cuddalore
8595.20
 
Sub Total  
157245.33
Madurai Region
Gundar
20
Kanal odai Virudhunagar
8356.01
 
21
Uthirakosamangai Ramanathapuram
9963.43
 
22
Vembar Ramanathapuram/ Virudhunagar
1789.04
 
23
Palar Ramanathapuram
2598.99
 
24
Girdhamal Ramanathapuram
24934.50
 
25
Lower Gunder Ramanathapuram/ Thoothukkudi
2178.90
Vaippar
26
Deviar Virudhunagar
5250.59
 
27
Nagarier Virudhunagar
1359.50
 
28
Sevalaperiyar Virudhunagar
759.17
 
29
Uppathur Thoothukkudi
288.29
 
30
Vallampatti Virudhunagar
471.29
 
31
Main River Thoothukkudi
3767.16
Tambaraparani
32
Uppodai Thoothukkudi
1505.40
Nambiyar
33
Hanumannadhi (Nambiyar) Tirunelveli
1930.69
 
34
Karumeniar Tirunelveli
7834.56
Kallar
35
Salikulamer Thoothukkudi
1858.96
 
36
Korampallam Ar. Thoothukkudi
923.73
Kodayar
37
Chittar ( Kodayar ) Kanyakumari
6148.72
Vaigai
38
Theniar Theni
2549.70
 
Sub Total  
84468.63
 
III - Year Total  
241713.96
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